Decorative sheets and decorative panels

Abstract

To provide a decorative sheet having superior designability with a picture pattern of a pattern layer and a recess part synchronized, and excellent processing suitability to wrapping processing.SOLUTION: A decorative sheet at least includes a pattern layer, a transparent resin layer, and a surface protective layer in this order on one side of a base material. The pattern layer is a wood grain pattern having a feature part and a non-feature part. The transparent resin layer is less than 90 μm thick. The surface protective layer is less than 25 μm thick. The transparent resin layer has a recess part (D1) synchronized with the feature part of the pattern layer, on a side opposite to a side having the pattern layer. In the decorative sheet, each of an upper yield point load (PMD) in a flow direction and an upper yield point load (PCD) in a crosswise direction is 25 to 35 N. A ratio (PMD / PCD) of the upper yield point loads in the flow direction and the crosswise direction is 1.00 to 1.15.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a decorative sheet and a decorative board using said decorative sheet. [Background technology]

[0002] 2. Description of the Related Art When it is desired to decorate components used in building materials, furniture, home appliances, and the like, decorative panels having a decorative sheet with a design attached thereto are generally used.

[0003] In order to impart visual design to the decorative board, the decorative sheet may be embossed or otherwise processed to form a concave-convex shape, thereby imparting a three-dimensional visual effect.

[0004] For example, Patent Document 1 discloses a decorative sheet which is characterized in that on one side of a base sheet, a pattern printed layer having a pattern printed thereon, a transparent thermoplastic resin layer having a rugged pattern that matches the pattern, a surface protective layer that protects the surface of the transparent thermoplastic resin layer, and a gloss adjustment layer having a pattern with a gloss state that matches the pattern are laminated in this order, with the resin that constitutes the surface protective layer penetrating the ruggedness of the rugged pattern.

[0005] In the decorative sheet of Patent Document 1, a concave-convex pattern is formed on the surface of the transparent thermoplastic resin layer on the side having the surface protective layer, thereby harmonizing the pattern of the picture printed layer with the concave-convex pattern of the transparent thermoplastic resin layer, improving the tactile feel and three-dimensional effect, and improving the realism of the pattern.

[0006] In recent years, there has been a demand for extremely excellent designs in which the pattern of the picture layer is more in tune with the uneven shape formed in the decorative sheet, and the decorative sheet of Patent Document 1 is still not sufficient, leaving room for further improvement. Furthermore, when conventional decorative sheets are used by wrapping them around adherends such as stairs or framed steps, they are attached to the adherend in a folded state, which can sometimes cause cracks at the folded parts or the sheets to lift off (peel off) from the adherend. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-182748 A Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention is intended to solve the above-mentioned problems, and aims to provide a decorative sheet in which the pattern of the decorative layer is in harmony with the recesses, giving it excellent design properties and excellent suitability for wrapping processing, and a decorative panel using said decorative sheet. [Means for solving the problem]

[0009] The present inventors have conducted intensive research to solve the above-mentioned problems, and have discovered a decorative sheet having at least a picture layer, a transparent resin layer, and a surface protective layer, in this order, on one side of a base sheet, wherein the picture layer has a wood grain pattern, the transparent resin layer and the surface protective layer have thicknesses in a predetermined range, and the surface protective layer has a recess (D1) that is in sync with a characteristic portion of the picture layer, and further has an upper yield point load (P MD ) and the upper yield point load in the width direction (P CD The inventors have found that when the ratio of the recesses to the pattern layer is within a predetermined range and in a specific ratio, the pattern layer has a pattern that is in harmony with the recesses, resulting in an excellent design and excellent suitability for wrapping, and have thus completed the present invention.

[0010] That is, the decorative sheet of the present invention is a decorative sheet having at least a pattern layer, a transparent resin layer, and a surface protective layer, in this order, on one side of a substrate, the pattern layer being a wood grain pattern having a characteristic portion and a non-characteristic portion, the transparent resin layer having a thickness of less than 90 μm, the surface protective layer having a thickness of less than 25 μm, the transparent resin layer having a recess (D1) that is in phase with the characteristic portion of the pattern layer on the side opposite to the side having the pattern layer, and the decorative sheet has an upper yield point load (P MD) and the upper yield point load in the width direction (P CD ) is 25N or more and 35N or less, and the ratio of the upper yield point load in the machine direction and the width direction (P MD / P CD ) is 1.00 or more and 1.15 or less.

[0011] In the decorative sheet of the present invention, the base sheet is preferably made of a colored polyolefin film having a thickness of 50 μm or more and 70 μm or less. In addition, the elastic modulus (E MD ) and transverse elastic modulus (E CD ) is 850 MPa or more and 1100 MPa or less, and the ratio of the elastic modulus in the machine direction to the width direction (E MD / E CD ) is preferably 1.00 or more and 1.20 or less. In addition, it is preferable that the characteristic portion of the pattern layer is formed from at least one pattern selected from the group consisting of vessels, knots, annual rings, and spots in the wood grain, and that the color difference ΔE between the characteristic portion and the non-characteristic portion of the pattern layer is 1.3 or more. The decorative board of the present invention is characterized by comprising the decorative sheet of the present invention on an adherend. Effect of the Invention

[0012] The present invention can provide a decorative sheet in which the picture pattern of the picture layer and the recesses are in harmony and which has extremely excellent design properties and excellent suitability for wrapping, and a decorative board using said decorative sheet. [Brief description of the drawings]

[0013] [Figure 1] 1(a) and 1(b) are cross-sectional views that diagrammatically show one example of the decorative sheet of the present invention. [Diagram 2] FIG. 1 is a diagram showing an example of a load-elongation curve when a test is performed using a tension-compression tester. [Diagram 3] 1(a) to 1(c) are cross-sectional views that typically show one example of the decorative sheet of the present invention. [Figure 4]FIG. 1(a) is a perspective view showing a schematic example of a decorative sheet of the present invention, FIG. 1(b) is a top view showing a schematic example of a decorative sheet of the present invention, and FIG. 1(c) is a cross-sectional view showing a schematic example of a decorative sheet of the present invention. [Diagram 5] FIG. 1 is a cross-sectional view showing a schematic diagram of a preferred example of the decorative sheet of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] <Decorative sheet> The decorative sheet of the present invention will now be described. In the following description, the lower and upper limits of a numerical range expressed with "to" means "greater than or equal to" (for example, if α~β, then it is greater than or equal to α and less than or equal to β).

[0015] The decorative sheet of the present invention has at least a design layer, a transparent resin layer, a transparent thermoplastic resin layer, and a surface protective layer, in this order, on one side of a base sheet. FIG. 1 is a cross-sectional view that illustrates a schematic example of a decorative sheet. In one example of a decorative sheet of the present invention shown in Figure 1, the decorative sheet 10 has at least a pattern layer 2, a transparent resin layer 3, and a surface protective layer 4, in that order, on one side of a base sheet 1, and the pattern layer 2 has a characteristic portion 2a and a non-characteristic portion 2b. In addition, the transparent resin layer 3 has a recess (D 1 In the decorative sheet 10 of the present invention shown in FIG. 1, the pattern layer 2 has a recess (D 1 ) in the stacking direction. 2 )

[0016] The decorative sheet 10 of the present invention has an upper yield point load (P MD ) and the upper yield point load in the width direction (P CD If the compressive strength is less than 25N, the pattern and the recesses (D 1If the load exceeds 35N, the material will be too rigid and will crack or peel off from the substrate when wrapped. MD ) and the upper yield point load in the width direction (P CD ) is preferably 26N in lower limit and 33N in upper limit.

[0017] In this specification, the upper yield load (N) of the decorative sheet is calculated by multiplying the tensile yield stress (MPa) measured in accordance with JIS K7161 (1994) by the initial cross-sectional area (mm 2 ) The tensile yield stress is a physical property defined in JIS K7161 (1994) and is the initial stress at which strain increases without an increase in stress (however, it may be smaller than the maximum stress). The upper yield point load is the load at which the test piece yields, and is the load at b in the example of the load-elongation curve shown in Figure 2.

[0018] The upper yield point load of the decorative sheet in this specification is specifically determined by measuring the upper yield point load (P MD ) and upper yield point load in the width direction (P CD ) and measured at a temperature of 25°C using a tensile / compression testing machine (Orientec Co., Ltd.: Tensilon RTC-1250A) at a tensile speed of 50 mm / min and a chuck distance of 80 mm. The tensile speed and chuck distance are based on the JIS K7127 (1999) regulations.

[0019] Here, the flow direction is the direction horizontal to the flow of the wood grain pattern of the picture layer of the decorative sheet 10 of the present invention, and the width direction is the direction perpendicular to the flow direction of the wood grain pattern, and both can be easily distinguished from the wood grain pattern appearing on the decorative sheet 10 of the present invention.

[0020] In the decorative sheet 10 of the present invention, the ratio of the upper yield point load in the machine direction to the width direction (P MD / P CD ) is 1.00 or more and 1.15 or less. MD / P CD ) falls within the above range, the decorative sheet of the present invention has excellent suitability for wrapping processing.

[0021] In addition, the decorative sheet 10 of the present invention has a machine direction elastic modulus (E MD ) and transverse elastic modulus (E CD ) is preferably 850 MPa or more and 1100 MPa or less. If it is less than 850 MPa, the pattern and the recessed portion (D 1 If the elastic modulus exceeds 1100 MPa, the decorative sheet 10 of the present invention may become too rigid and may be less suitable for wrapping. MD ) and transverse elastic modulus (E CD ) is more preferably 900 MPa, and more preferably 1080 MPa.

[0022] In addition, the decorative sheet 10 of the present invention has a ratio of elastic modulus in the machine direction to the width direction (E MD / E CD It is preferable that the ratio (E MD / E CD ) falls within the above range, the decorative sheet 10 of the present invention has excellent suitability for wrapping processing.

[0023] The elastic modulus in the flow direction (E MD ) and transverse elastic modulus (E CD ) is, for example, the elastic modulus in the machine direction (E MD ) and transverse elastic modulus (E CD ) were prepared and measured at a temperature of 20°C using a tensile compression testing machine at a tensile speed of 50 mm / min and a chuck distance of 80 mm. The initial linear portion of the tensile stress-strain curve was used to calculate the strain using the following formula. E = Δρ / Δε E: Elastic modulus Δρ: Stress difference due to the original average cross-sectional area between two points on a line Δε: Strain difference between the same two points

[0024] In addition, the decorative sheet 10 of the present invention has a ratio of elastic modulus in the machine direction to the width direction (E MD / E CD It is preferable that the ratio (E MD / E CD ) falls within the above range, the decorative sheet 10 of the present invention has excellent suitability for wrapping processing.

[0025] In the decorative sheet 10 of the present invention, the upper yield point load (P MD ) and the upper yield point load in the width direction (P CD ) and the elastic modulus in the flow direction (E MD ) and transverse elastic modulus (E CD ), and the ratio of these (P MD / P CD ), (E MD / E MD ) can be adjusted to fall within the above-mentioned range by, for example, appropriately adjusting the conditions (such as the blending ratio of raw materials and the curing treatment conditions) when producing the surface protective layer. Next, each layer that constitutes the decorative sheet 10 will be described.

[0026] (Base sheet) The decorative sheet 10 of the present invention has a base sheet 1. The base sheet 1 is not particularly limited, but preferably contains a non-halogen-based thermoplastic resin.

[0027] Examples of the non-halogen-based thermoplastic resin include olefin-based thermoplastic resins such as low-density polyethylene (including linear low-density polyethylene), medium-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymer, homopolypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer, ethylene-vinyl acetate copolymer, saponified ethylene-vinyl acetate copolymer, and mixtures thereof; thermoplastic ester-based resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, and polyarylate; acrylic thermoplastic resins such as polymethyl methacrylate, polyethyl methacrylate, polyethyl acrylate, and polybutyl acrylate; polyamide-based thermoplastic resins such as nylon-6 and nylon-66; and polyimide, polyurethane, polystyrene, and acrylonitrile-butadiene-styrene resins. These non-halogen-based thermoplastic resins may be used alone or in combination of two or more. Among these, olefin-based thermoplastic resins are preferred because they are excellent in printability for the design layer 2 and inexpensive.

[0028] The base sheet 1 may be colored. In this case, the non-halogen-based thermoplastic resin can be colored by adding a coloring agent (pigment or dye). As the colorant, for example, inorganic pigments such as titanium dioxide, carbon black, and iron oxide, organic pigments such as phthalocyanine blue, and various dyes can be used. These may be selected from known or commercially available materials, and the amount of colorant added may be appropriately determined according to the desired color tone, etc.

[0029] The base sheet 1 may contain various additives, such as a filler, a matting agent, a foaming agent, a flame retardant, a lubricant, an antistatic agent, an antioxidant, an ultraviolet absorbing agent, and a light stabilizer, as necessary.

[0030] The thickness of the base sheet 1 is not particularly limited, but is preferably 40 μm or more and 200 μm or less. The base sheet 1 may be constructed as either a single layer or multiple layers. In particular, in the decorative sheet 10 of the present invention, the base sheet 1 is preferably made of a colored polyolefin film having a thickness of 50 μm or more and 70 μm or less. By providing a base sheet 1 made of a colored polyolefin film of such a thickness, the requirements for the upper yield load and elastic modulus described above can be more easily satisfied in the combination of the thickness ranges of the transparent resin layer 3 and the surface protective layer 4 described below.

[0031] (Picture layer) The decorative sheet 10 has a pattern layer 2. The pattern layer 2 is a layer that imparts decorativeness to the decorative sheet 10.

[0032] The design layer 2 may be, for example, a design layer formed by printing various patterns using ink and a printing machine, or may be a layer combining a concealing layer and a design layer.

[0033] By providing the concealing layer, when the above-mentioned base sheet 1 is colored or has color unevenness, it is possible to impart an intended color and adjust the color of the surface. Furthermore, by providing a pattern layer, the pattern layer 2 having a wood grain pattern can be suitably obtained. These design patterns are formed by multi-color printing using the usual process colors of yellow, red, blue, and black, as well as by multi-color printing using special colors in which the individual colors that make up the pattern are prepared.

[0034] The ink composition used for the design layer 2 is a suitable mixture of a binder resin, a colorant such as a pigment or dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a hardener, and the like.

[0035] The binder resin is not particularly limited, and preferred examples thereof include urethane resin, acrylic resin, urethane-acrylic resin, urethane-acrylic copolymer resin, vinyl chloride / vinyl acetate copolymer resin, vinyl chloride / vinyl acetate / acrylic copolymer resin, acrylic resin, polyester resin, nitrocellulose resin, etc. Any of these may be used as the binder resin, either alone or in combination of two or more.

[0036] Preferred examples of the colorant include inorganic pigments such as carbon black (ink), iron black, titanium white, antimony white, yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, and cobalt blue; organic pigments such as quinacridone red, isoindolinone yellow, and phthalocyanine blue; metal pigments consisting of scaly flakes of dyes, aluminum, brass, and the like; and pearlescent (pearl) pigments consisting of scaly flakes of titanium dioxide-coated mica, basic lead carbonate, and the like. These can be used alone or in combination of two or more.

[0037] The pattern layer 2 is a wood grain pattern having a characteristic portion 2a and a non-characteristic portion 2b. The characteristic portion 2a refers to a portion having characteristics that allow the pattern of the pattern layer 2 to be recognized, such as vessels in the wood grain, knots, annual rings, and spots. Moreover, the non-characteristic portion 2b refers to a portion other than the characteristic portion 2a.

[0038] In the pattern layer 2, the color difference ΔE between the characteristic portion 2a and the non-characteristic portion 2b is preferably 1.3 or more. By setting the color difference ΔE in this range, it is possible to achieve a more excellent design. The color difference ΔE is more preferably 1.5 or more, further preferably 1.8 or more, and particularly preferably 2.0 or more.

[0039] In this specification, the method for measuring and calculating the color difference ΔE is as follows. In the decorative sheet 10, the L of the characteristic portion 2a and the non-characteristic portion 2b *a * b * Color space L * , a * and b * Using a spectrophotometer (SE6000 manufactured by Nippon Denshoku Industries Co., Ltd.), light (D65 light source) is irradiated onto the surface of the side of the decorative sheet 10 having the transparent resin layer 3 (the side having the surface protective layer if a surface protective layer 4 is present) at an incident angle of 10 degrees (the normal direction to the surface on the transparent resin layer 3 side is set to 0 degrees), and the value is measured based on the total reflected light (specular reflected light + diffuse reflected light). Here, L in the characteristic portion 2a * , a * and b * L 1 * , a 1 * and b 1 * and L in the non-characteristic portion 2b * , a * and b * L 2 * , a 2 * and b 2 * Let us assume that. In addition, "L * a * b * "Color system" refers to the color system standardized by the CIE (International Commission on Illumination) and adopted in JIS Z8781-4:2013. * a * b * In the color system, lightness is L * The chromaticity, which indicates the hue and saturation, is a * , b * It is expressed as:

[0040] The above measured values ​​can be substituted into the following formula to calculate the value. Color difference ΔE=((L 1 * -L 2 * ) 2 +(a 1 * -a 2 * )2 +(b 1 * -b 2 * ) 2 ) 1 / 2

[0041] The thickness of the design layer 2 is not particularly limited, and is preferably, for example, 0.1 μm or more, and more preferably 0.5 μm or more and 600 μm or less. If the thickness of the design layer 2 is within the above range, it is possible to impart an excellent design to the decorative sheet 10 and also to impart hiding properties.

[0042] Methods for forming the design layer 2 include, for example, gravure printing, offset printing, screen printing, flexographic printing, electrostatic printing, inkjet printing, etc. In addition, when forming a concealing layer, various coating methods such as roll coating, knife coating, air knife coating, die coating, lip coating, comma coating, kiss coating, flow coating, dip coating, etc. can also be used.

[0043] (Transparent resin layer) The decorative sheet 10 has a transparent resin layer 3 . The transparent resin layer 3 is preferably a layer formed from a thermoplastic resin. The transparent resin layer 3 is not particularly limited as long as it allows the pattern layer 2 to be seen, and may be any of colorless transparent, colored transparent, translucent, and the like.

[0044] Examples of the thermoplastic resin include olefin resins such as polyethylene, polypropylene, polybutene, polymethylpentene, and olefin-based thermoplastic elastomers; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, ethylene glycol-terephthalic acid-isophthalic acid copolymer resin, terephthalic acid-ethylene glycol-1,4-cyclohexanedimethanol copolymer resin, and polyester-based thermoplastic elastomers; acrylic resins such as polymethyl (meth)acrylate, methyl (meth)acrylate-butyl (meth)acrylate copolymer resin, and methyl (meth)acrylate-styrene copolymer resin; polycarbonate resin, polyvinyl chloride, polystyrene, and ionomers. Among these, polyethylene or polypropylene is more preferred because of its high tensile strength, excellent chemical resistance, and excellent production process. In this specification, (meth)acrylate means acrylate or methacrylate.

[0045] The polyethylene may be a homopolymer of ethylene or a copolymer of ethylene and another comonomer copolymerizable with ethylene (e.g., an α-olefin such as propylene, 1-butene, 1-hexene, or 1-octene, vinyl acetate, or vinyl alcohol). Examples of polyethylene resins include high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), ultra high molecular weight polyethylene (UHMWPE), and cross-linked polyethylene (PEX). These polyethylenes may be used alone or in combination of two or more.

[0046] The polypropylene may be a homopolymer of propylene or a copolymer of propylene and another comonomer copolymerizable with propylene (e.g., α-olefins such as ethylene, 1-butene, 1-hexene, and 1-octene; vinyl acetate, vinyl alcohol, etc.). These polypropylenes may be used alone or in combination of two or more. In the present invention, a homopolymer of propylene (homopolypropylene) is particularly preferred from the viewpoint of excellent scratch resistance and bending processability.

[0047] The transparent resin layer 3 may be composed of one layer, or may be composed of two or more layers.

[0048] The thickness of the transparent resin layer 3 is less than 90 μm. By having a transparent resin layer 3 of such a thickness, the decorative sheet 10 of the present invention has excellent processability for wrapping. The thickness of the transparent resin layer 3 is preferably 80 μm or less.

[0049] When the transparent resin layer 3 is composed of two or more layers, the total thickness of the transparent resin layer 3 must be within the above range.

[0050] When the transparent resin layer 3 is composed of a plurality of layers, the resins may be the same or different, and the thicknesses of the base material made of a plurality of resins may be the same or different. The method for laminating two or more transparent resin layers 3 is not limited as long as it is a common method, and examples thereof include dry lamination and extrusion heat lamination.

[0051] The transparent resin layer 3 may be subjected to surface treatment such as saponification treatment, glow discharge treatment, corona discharge treatment, plasma discharge treatment, ultraviolet (UV) treatment, and flame treatment, without departing from the spirit of the present invention.

[0052] (Surface protective layer) The decorative sheet 10 preferably has a surface protective layer on the side of the transparent resin layer 3 opposite to the side on which the pattern layer 2 is provided. The surface protective layer 4 may have a recess as shown in FIG. 1(a), or may not have a recess as shown in FIG. 1(b).

[0053] The surface protective layer 4 is a layer that imparts durability (scratch resistance, contamination resistance, weather resistance, etc.) to the decorative sheet 10, and by having the surface protective layer 4, it is possible to more effectively protect the pattern layer 2, and it is possible to effectively prevent a decrease in the design due to scratches on the decorative sheet 10 itself. The surface protective layer 4 may be a single layer structure, or a multi-layer structure made of the same or different materials, or may be a suitable mixture of the materials shown below.

[0054] The surface protective layer 4 is not particularly limited, but may be made of, for example, a two-component curable resin or a crosslinked cured product of an ionizing radiation curable resin composition. The above-mentioned crosslinked and cured product is preferably transparent, and may be translucent or colored so long as it is transparent to the extent that the design layer 2 can be visually recognized.

[0055] The two-component curable resin is not particularly limited as long as it is a resin that is cured by adding a curing agent to a base material. A two-component curable urethane resin in which the base material is a polyol (polyhydric alcohol) and the curing agent is an isocyanate curing agent is preferred. As the ionizing radiation curable resin, for example, an oligomer (hereinafter including so-called prepolymers, macromonomers, etc.) having a radical polymerizable unsaturated bond or a cationic polymerizable functional group in the molecule and / or a monomer having a radical polymerizable unsaturated bond or a cationic polymerizable functional group in the molecule is preferably used. Here, ionizing radiation means electromagnetic waves or charged particles having energy capable of polymerizing or crosslinking molecules, and generally includes electron beams (EB) or ultraviolet rays (UV).

[0056] Examples of the oligomer or monomer include compounds having radical polymerizable unsaturated groups such as (meth)acryloyl groups and (meth)acryloyloxy groups, and cationic polymerizable functional groups such as epoxy groups in the molecule. These oligomers and monomers can be used alone or in combination. In this specification, the (meth)acryloyl group means an acryloyl group or a methacryloyl group.

[0057] As the oligomer having a radical polymerizable unsaturated group in the molecule, for example, oligomers such as urethane (meth)acrylate, polyester (meth)acrylate, epoxy (meth)acrylate, melamine (meth)acrylate, triazine (meth)acrylate, etc. can be preferably used, and urethane (meth)acrylate oligomer is more preferable. As the molecular weight, those having about 250 to 100,000 are usually used.

[0058] The monomer having a radically polymerizable unsaturated group in the molecule is preferably, for example, a polyfunctional monomer, and more preferably a polyfunctional (meth)acrylate. Examples of the polyfunctional (meth)acrylate include diethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, bisphenol A ethylene oxide modified di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane ethylene oxide tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate {pentafunctional (meth)acrylate}, dipentaerythritol hexa(meth)acrylate {hexafunctional (meth)acrylate}, etc. Here, the polyfunctional monomer refers to a monomer having a plurality of radically polymerizable unsaturated groups.

[0059] It is more preferable that the ionizing radiation curable resin composition contains an ionizing radiation curable resin component consisting of a urethane acrylate oligomer and a polyfunctional monomer, and it is particularly preferable that the ionizing radiation curable resin component has a urethane acrylate oligomer / polyfunctional monomer (mass ratio) of 6 / 4 to 9 / 1. If the mass ratio is within this range, the composition can have better scratch resistance. If necessary, a monofunctional monomer may be appropriately used in addition to the ionizing radiation curable resin component. Examples of the monofunctional monomer include methyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and phenoxyethyl (meth)acrylate.

[0060] When the ionizing radiation curable resin composition is crosslinked by ultraviolet light, it is preferable to add a photopolymerization initiator to the ionizing radiation curable resin composition. When the ionizing radiation curable resin composition is a resin system having a radical polymerizable unsaturated group, acetophenones, benzophenones, thioxanthones, benzoins, and benzoin methyl ethers can be used alone or in combination as the photopolymerization initiator. In addition, when the ionizing radiation curable resin composition is a resin system having a cationically polymerizable unsaturated group, the photopolymerization initiator may be an aromatic diazonium salt, an aromatic sulfonium salt, an aromatic iodonium salt, a methacerone compound, a benzoin sulfonate ester, etc., either alone or in combination. The amount of these photopolymerization initiators to be added is about 0.1 to 10 parts by mass per 100 parts by mass of the ionizing radiation curable resin component.

[0061] In addition, various additives may be added to the ionizing radiation curable resin composition as necessary. Examples of these additives include thermoplastic resins such as urethane resins, polyvinyl acetal resins, polyester resins, polyolefin resins, styrene-based resins, polyamide resins, polycarbonate resins, acetal resins, vinyl chloride-vinyl acetate copolymer resins, vinyl acetate resins, acrylic resins, and cellulose-based resins, lubricants such as silicone resins, waxes, and fluorine resins, ultraviolet absorbers such as benzotriazole, benzophenone, and triazine, light stabilizers such as hindered amine-based radical scavengers, and colorants such as dyes and pigments.

[0062] As the electron beam source of the ionizing radiation, for example, various electron beam accelerators such as Cockcroft-Walton type, Van de Graff type, resonant transformer type, insulating core transformer type, or linear type, dynamitron type, high frequency type, etc. can be used, which irradiate electrons having an energy of 70 to 1000 keV. The exposure dose of the ionizing radiation is preferably, for example, about 1 to 10 Mrad. As the ultraviolet ray source of the ionizing radiation, for example, light sources such as ultra-high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arc lamps, black lights, metal halide lamps, etc. can be used, and the wavelength of the ultraviolet ray is usually in the wavelength range of 190 to 380 nm.

[0063] In the decorative sheet 1 of the present invention, the thickness of the surface protective layer 4 is less than 25 μm. By having a surface protective layer 4 of such a thickness, the decorative sheet 10 of the present invention has excellent suitability for wrapping processing. The thickness of the surface protective layer 4 is preferably 15 μm or less.

[0064] The surface protective layer 4 may be composed of a single layer or two or more layers. If it is composed of multiple layers, the materials constituting each layer may be the same or different, but the total film thickness is less than 25 μm. In addition, it is preferable that the surface protective layer 4 contains inorganic fine particles such as silica fine particles because they can provide excellent scratch resistance. Known silica fine particles can be used, but it is preferable that the average particle size of the silica fine particles is equal to or smaller than the thickness of the surface protective layer 4 in which they are contained.

[0065] (Other layers) The decorative sheet 10 may have a primer layer, an adhesive layer, a backer layer, and the like, as necessary.

[0066] The primer layer can be formed by applying a known primer agent. Examples of the primer agent include a urethane resin-based primer agent made of an acrylic-modified urethane resin (acrylic urethane-based resin), a primer agent made of a urethane-cellulose-based resin (for example, a resin obtained by adding hexamethylene diisocyanate to a mixture of urethane and soluble nitrocellulose), and a resin-based primer agent made of a block copolymer of acrylic and urethane. The primer agent may contain additives as necessary. Examples of the additives include fillers such as calcium carbonate and clay, flame retardants such as magnesium hydroxide, antioxidants, lubricants, foaming agents, ultraviolet absorbers, and light stabilizers. The amount of additives to be added can be appropriately set according to the product characteristics.

[0067] The primer layer may contain an ultraviolet absorbing agent, if necessary. As the ultraviolet absorbing agent, any known ultraviolet absorbing agent can be appropriately selected and used.

[0068] The thickness of the primer layer is not particularly limited, but is, for example, preferably 0.01 to 10 μm, and more preferably 0.1 to 1 μm.

[0069] The adhesive layer is not particularly limited, and any known adhesive may be used. Examples include polyurethane, acrylic, polyolefin, polyvinyl acetate, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ionomer, butadiene-acrylonitrile rubber, neoprene rubber, natural rubber, etc. These adhesives may be used alone or in combination of two or more.

[0070] The adhesive layer preferably has a thickness after drying of about 0.1 to 30 μm, more preferably about 1 to 5 μm.

[0071] The decorative sheet 10 may have a backer layer as the bottom layer of the substrate 1 (the side opposite to the side on which the above-mentioned design layer 2 is laminated) in order to impart scratch resistance and impact resistance. As the backer layer, a known backer layer disclosed in, for example, JP-A-2014-188941 can be appropriately selected and used.

[0072] (Recesses (D1) and (D2)) 1, the decorative sheet of the present invention has a transparent resin layer 3 having a recess (D1) on the side opposite to the side having the pattern layer 2, the recess (D1) being in line with the characteristic portion 2a of the pattern layer 2. In addition, it is preferable that the pattern layer 2 has a recess (D2) on the side opposite to the side having the substrate 1, the recess (D2) being located in the lamination direction of the recess (D1).

[0073] The recess (D1) has a shape that matches the characteristic portion 2a of the design layer 2. The recess (D1) may have a shape that is modeled after the outline of the characteristic portion 2a of the pattern of the pattern layer 2, or may have a simplified shape of the outline of the characteristic portion 2a of the pattern of the pattern layer 2, or may have a similar shape that is a reduced or enlarged version of the outline of the characteristic portion 2a.

[0074] The recess (D1) is positioned so as to coincide with the characteristic portion 2a of the pattern layer 2. 3(a) to (c) are cross-sectional views that diagrammatically show one example of the decorative sheet of the present invention. The positional relationship between the recess (D1) and the characteristic portion 2a of the design layer 2 may be any one of those shown in Figs. 3(a) to (c). That is, as shown in Figure 3(a), in the stacking direction, the characteristic portion 2a of the pattern layer 2 and the recess (D1) may be positioned so as to overlap, as shown in Figure 3(b), the characteristic portion 2a of the pattern layer 2 and the recess (D1) may be positioned so as to partially overlap, or as shown in Figure 3(c), the characteristic portion 2a of the pattern layer 2 and the recess (D1) may be positioned so as not to overlap. 3(c), in plan view, the recess (D1) is located in the vicinity of the characteristic portion 2a of the pattern layer 2. The above-mentioned vicinity means that in plan view, the distance between the position of the characteristic portion 2a and the position of the recess (D1) having a shape corresponding to the characteristic portion 2a is 70 mm or less. These can be appropriately set depending on the design of the picture layer 2. The harmonious relationship between the recess (D1) and the characteristic portion 2a does not necessarily have to be established over the entire surface of the design, and there may be some areas where they are not harmonious as long as the overall design feeling is not impaired. The width of the recess (D1) will be described later.

[0075] The recess (D2) is located in the stacking direction of the recess (D1). As shown in FIGS. 3(a) to (c), the recess (D2) is located at a position overlapping with the recess (D1) in the stacking direction. In addition, the recess (D2) may be formed in the characteristic portion 2a of the pattern layer 2 as shown in Figure 3(a), or may be formed extending from the characteristic portion 2a to the non-characteristic portion 2b of the pattern layer 2 as shown in Figure 3(b), or may not be formed in the characteristic portion 2a of the pattern layer 2 as shown in Figure 3(c) (the recess (D2) is formed in the non-characteristic portion 2b).

[0076] In the decorative sheet 10, the depth H of the recess (D1) is preferably greater than the depth h of the recess (D2). By providing such recesses (D1) and recesses (D2), the picture pattern of the picture layer and the recesses are in harmony with each other, and it is possible to provide an extremely excellent design with a visually three-dimensional effect. The relationship between the depth H of the recess (D1) and the depth h of the recess (D2) applies between the recess (D1) and the recess (D2) that are located in the stacking direction (overlapping when viewed in a plane).

[0077] In the decorative sheet 10, from the viewpoint of imparting a suitable three-dimensional effect, the ratio (h / H) of the depth h of the recess (D2) to the depth H of the recess (D1) is preferably 0.25 or more and 0.60 or less, more preferably 0.26 or more and 0.55 or less, even more preferably 0.28 or more and 0.50 or less, and particularly preferably 0.30 or more and 0.48 or less.

[0078] The depth H of the recess (D1) may be any size that can favorably impart a three-dimensional effect, and is, for example, preferably 50 μm or more and 200 μm or less, and more preferably 55 μm or more and 190 μm or less. The depth h of the recess (D2) is, for example, preferably 13 μm or more and 100 μm or less, and more preferably 17 μm or more and 92 μm or less. In addition, the numerical ranges of the depth H and the depth h do not necessarily have to be established for all recesses (D1) and recesses (D2). As long as the overall design is not impaired, there may be recesses (D1) and recesses (D2) that do not satisfy the numerical ranges. For example, as long as the overall design is not impaired, some of the harmonious recesses (D1) and recesses (D2) may not satisfy the magnitude relationship of depth H>depth h. However, from the viewpoint of providing a suitable design, when the decorative sheet 10 is viewed in plan and the recesses (D1) and (D2) located in the stacking direction in any 10 cm x 10 cm area are checked, it is preferable that less than 30% of the recesses do not satisfy the relationship of depth H > depth h. Such checking can be performed using an electron microscope and its measurement conditions described below.

[0079] The width W of the recess (D1) depends on the design formed on the design layer 2, but is preferably, for example, from 400 μm to 2000 μm, and more preferably from 500 μm to 1500 μm. The width w of the recess (D2) is, for example, preferably 5 μm or more and 400 μm or less, and more preferably 10 μm or more and 100 μm or less.

[0080] It is preferable that the decorative sheet 10 has a recess (designated D3) on the side of the pattern layer 2 of the substrate 1 and a recess (designated D4) on the side opposite the pattern layer 2 of the substrate 1, which are located in the stacking direction of the recess (D1) and the recess (D2). In this case, it is preferable that the depths of the recesses decrease in the order of recess (D1), recess (D2), recess (D3), and recess (D4). Furthermore, when the decorative sheet 10 has a surface protective layer 4 and a recess (referred to as D5) on the opposite side of the surface protective layer 4 from the transparent resin layer 3, which is located in the lamination direction of the recess (D1) and the recess (D2), it is preferable that the depths of the recesses decrease in the order of recess (D5), recess (D1), recess (D2), recess (D3), and recess (D4). By providing such recesses (D1 to D5), it is possible to provide a suitable design in which the picture pattern of the picture layer and the recesses are in harmony with each other. Such recesses (D1 to D5) can be suitably formed by the manufacturing method of the decorative sheet of the present invention, which will be described later. The depth relationships of the recesses (D1 to D5) are established among the recesses (D1 to D5) located in the stacking direction (overlapping when viewed from above).

[0081] A method for measuring the width W and depth H of the recess (D1) and the width w and depth h of the recess (D2) will be described. FIG. 4(a) is a perspective view showing a schematic example of a decorative sheet of the present invention, (b) is a top view showing a schematic example of a decorative sheet of the present invention, and (c) is a cross-sectional view showing a schematic example of a decorative sheet of the present invention. As shown in Fig. 4(a), a recess formed on the surface of the decorative sheet 10 is selected. As shown in Fig. 4(b), the long axis and short axis of the selected recess are determined. Then, as shown in Fig. 4(c), the sheet is cut along the short axis, and the cut surface is observed under an electron microscope to measure the widths (W and w) and depths (H and h) of the recesses (D1) and (D2). As shown in Figure 4 (c), the depth H of the recess (D1) means the vertical distance from the surface of the transparent resin layer 3 to the deepest part of the recess (D1), and the depth h of the recess (D2) means the vertical distance from the surface of the pattern layer 2 to the deepest part of the recess (D2). The long axis of a recess refers to the point where the length of a straight line connecting two points on the periphery of the recess is at its maximum, and the short axis of a recess refers to the point where the length is at its maximum in the perpendicular direction to the long axis.

[0082] When the transparent resin layer 3 is the outermost layer, the minor axis of the recess formed on the surface of the decorative sheet 10 coincides with the width W of the recess (D1). 5, the decorative sheet 10 has at least the pattern layer 2, the transparent resin layer 3, and the surface protective layer 4, in this order, on one side of the base sheet 1, so the width W of the recess (D1) is smaller than the short axis of the recess formed on the surface of the decorative sheet 10. In this case, the cross section cut along the short axis of the recess can be observed and measured with an electron microscope.

[0083] The width W and depth H of the recess (D1), and the width w and depth h of the recess (D2) refer to the average values ​​calculated by randomly selecting 10 recesses formed on the surface of the decorative sheet 10 and measuring them using the method described above. The measurement conditions using an electron microscope include, for example, a shape analysis laser microscope (measuring unit "VK-X1050", base "VK-D1", controller "VK-X1000" (manufactured by KEYENCE Corporation)) and observation at a magnification of 300x.

[0084] Examples of resin paints that can be used to form a colored surface protective layer include organic solvent-based paints made of urethane resin, acrylic urethane resin, epoxy resin, polyester resin, etc., which have excellent quick-drying properties, and water-based paints that are friendly to the natural and working environments. Among these, water-based paints containing urethane resins are preferred. As the colorant, those described above for the design layer can be used. As a method for coloring with the resin coating material, for example, the method described in Japanese Patent No. 4569720 can be applied.

[0085] <Method of manufacturing decorative sheets> A manufacturing method for the decorative sheet of the present invention, for example in the configuration shown in Figure 1(a), can include a lamination step in which a pattern layer having characteristic and non-characteristic parts, a transparent resin layer, and a surface protective layer are laminated at least in this order on one side of a base sheet, and a shaping step in which embossing is performed on the side of the surface protective layer opposite to the side having the pattern layer, to form a recess (D1) in sync with the characteristic part of the pattern layer on the side of the transparent resin layer opposite to the side having the pattern layer. In the forming step, a recess (D2) can also be formed on the opposite side of the pattern layer from the substrate in the lamination direction of the recess (D1). In this case, the depth H of the recess (D1) is preferably greater than the depth h of the recess (D2).

[0086] The lamination step is a step of laminating a design layer, a transparent resin layer, and a surface protective layer at least in this order on one side of a base sheet.

[0087] In the lamination process, the above-mentioned base sheet 1, pattern layer 2, transparent resin layer 3 and surface protective layer 4 can be used, and the pattern layer 2, transparent resin layer 3 and surface protective layer 4 may be laminated at least in this order on one side of the base sheet 1. The above-mentioned adhesive layer or primer layer may be provided on one surface of each of the above-mentioned layers or between the layers. At this time, the thicknesses of the transparent resin layer and the surface protective layer are set to be within the above-mentioned ranges, and further, the compounding ratio of the raw materials of the surface protective layer, the hardening treatment conditions, the aging treatment conditions, etc. are adjusted to obtain the upper yield point load (P MD ) and upper yield point load in the width direction (P CD ) and their ratios are adjusted to fall within the above-mentioned ranges.

[0088] The shaping step is a step of embossing the surface protective layer from the side opposite to the side having the design layer, to form recesses that correspond to the characteristic portions of the design layer. By including the above-mentioned shaping process, a recess (D1) that is in sync with the characteristic portion of the pattern layer and a recess (D2) that is smaller than the recess (D1) are formed at a position in the stacking direction of the recess (D1) so as to follow the recess (D1).

[0089] The embossing may be carried out, for example, by a known sheet-type or rotary embossing machine. As the pattern used in the embossing process, a design that matches with the above-mentioned design layer 2 can be appropriately selected and used.

[0090] The temperature at which the embossing process is carried out is not particularly limited, but a temperature at which the disappearance of recesses during thermocompression molding, that is, so-called emboss return, is reduced is preferred.

[0091] In the case of the configuration shown in Figure 1(b), a method can be used in which a surface protective layer is not laminated in the lamination process, and the embossing process is performed from the side opposite to the side having the pattern layer of the transparent resin layer in the shaping process, and then a surface protective layer is laminated.

[0092] The decorative sheet produced by the method for producing a decorative sheet of the present invention has at least a pattern layer, a transparent resin layer, and a surface protective layer, in this order, on one side of a substrate, the transparent resin layer having a recess (D1) that is in sync with a characteristic portion of the pattern layer, and further has an elastic modulus in the machine direction (E MD ) and transverse elastic modulus (E CD) and the ratio of these is within a prescribed range, the design of the design layer and the recesses are in harmony with each other, providing an extremely excellent design and excellent scratch resistance.

[0093] <Decorative board> The decorative board of the present invention is characterized by comprising the decorative sheet of the present invention on an adherend.

[0094] Examples of the adherend include wood boards such as wood veneer, wood plywood, particle board, and MDF (medium density fiberboard); gypsum-based boards such as gypsum boards and gypsum slag boards; cement boards such as calcium silicate boards, asbestos slate boards, lightweight foamed concrete boards, and hollow extruded cement boards; fiber cement boards such as pulp cement boards, asbestos cement boards, and wood chip cement boards; ceramic boards such as pottery, porcelain, earthenware, glass, and enamel; metal boards such as iron boards, galvanized steel boards, polyvinyl chloride sol-coated steel boards, aluminum boards, and copper boards; polyolefin resin boards, polyvinyl chloride resin boards, acrylic resin boards, A Examples of such resins include thermoplastic resin plates such as BS plates and polycarbonate plates; thermosetting resin plates such as phenolic resin plates, urea resin plates, unsaturated polyester resin plates, polyurethane resin plates, epoxy resin plates and melamine resin plates; and so-called FRP plates formed by impregnating and curing resins such as phenolic resin, urea resin, unsaturated polyester resin, polyurethane resin, epoxy resin, melamine resin, and diallyl phthalate resin into glass fiber nonwoven fabric, cloth, paper, and other various fibrous base materials. These may be used alone, or two or more of these may be laminated together to form a composite substrate. In addition, the thermoplastic resin board and the thermosetting resin board may contain various additives, such as coloring materials (pigments or dyes), fillers such as wood powder or calcium carbonate, matting agents such as silica, foaming agents, flame retardants, lubricants such as talc, antistatic agents, antioxidants, ultraviolet absorbers, and light stabilizers, as necessary. The thickness of the adherend is not particularly limited. Furthermore, since the decorative sheet of the present invention has excellent workability in wrapping processing as described above, the above-mentioned adherend in the decorative board of the present invention can be suitably used even if it has a curved surface or corners.

[0095] The method for laminating the decorative sheet of the present invention to the above-mentioned adherend is not particularly limited, and examples include laminating via the above-mentioned primer layer or via the above-mentioned adhesive layer. EXAMPLES

[0096] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0097] Example 1 A 60 μm thick colored polypropylene film was prepared as a base sheet, a back primer layer (2 μm thick) was formed on the back surface of the base sheet, and a wood grain pattern layer was formed on the front surface of the base sheet by gravure printing to a thickness of 2 μm. A transparent adhesive layer was formed on the design layer using a urethane resin to a thickness of 2 μm. A transparent polypropylene resin sheet was laminated on the formed transparent adhesive layer using an extrusion lamination method to a thickness of 80 μm, forming a transparent resin layer. Next, the surface of the transparent resin layer was subjected to a corona discharge treatment, and then a two-component curing urethane resin was applied to form a primer layer (primer layer for forming a surface protective layer, thickness 2 μm). A urethane acrylate electron beam curable resin (EB resin) was applied to the surface of the primer layer using a gravure coating method so that the thickness after curing would be 15 μm.Then, in an environment with an oxygen concentration of 200 ppm or less, an electron beam was irradiated using an electron beam irradiation device under conditions of an acceleration voltage of 175 KeV and 5 Mrad to cure the electron beam curable resin, thereby forming a surface protective layer.

[0098] The material constituting the surface protective layer contained 10 parts by mass of silica fine particles (particle diameter 11 μm) having a particle diameter equal to or smaller than the coating thickness, per 100 parts by mass of the electron beam curable resin.

[0099] The surface protection layer formed as described above was heated with an infrared non-contact heater to soften the base sheet and the transparent resin layer, and immediately embossed with heat and pressure to form wood grain pattern recesses on the surface protection layer, thereby producing a decorative sheet.

[0100] (Examples 2 and 3, Comparative Examples 1 and 2) The thickness of the transparent resin layer, the surface protection layer, and the upper yield point load in the flow direction (P MD ) and the upper yield point load in the width direction (P CD ) and the elastic modulus in the machine direction (E MD ) and transverse elastic modulus (E CD A decorative sheet was produced in the same manner as in Example 1, except that the values ​​of the elastic modulus, elastic modulus and elastic modulus were adjusted to the values ​​shown in the table below.

[0101] <Design> The prepared decorative sheet was visually observed from above, and whether or not the picture pattern of the picture layer was in harmony with the recesses was evaluated based on human sensibility in accordance with the following criteria. The evaluation results are shown in Table 1. +: I feel like we're in sync. -: The misalignment is visible and it doesn't feel like they are in sync.

[0102] <Upper yield point load> The decorative sheets according to the examples and comparative examples were punched out in the machine direction and width direction to form dumbbell-shaped test pieces conforming to JIS K6732. The test pieces were subjected to a tensile test (machine used: ORIENTEC Tensilon universal material testing machine RTC-1250A) at a temperature of 20°C, a tensile speed of 50 mm / min, and a chuck distance of 80 mm, and the upper yield point load in the machine direction (P MD ) and upper yield point load in the width direction (P CD ) was sought.

[0103] <Elasticity modulus> The decorative sheets according to the examples and comparative examples were punched out in the machine direction and width direction to form dumbbell-shaped test pieces conforming to JIS K6732. The test pieces thus prepared were subjected to a tensile test (machine used: ORIENTEC Tensilon universal material testing machine RTC-1250A) at a temperature of 20°C, a tensile speed of 50 mm / min, and a chuck distance of 80 mm. The elastic modulus in the machine direction (E MD ) and transverse elastic modulus (E CD ) was calculated. E = Δρ / Δε E: Elastic modulus Δρ: Stress difference due to the original average cross-sectional area between two points on a line Δε: Strain difference between the same two points

[0104] [Table 1]

[0105] As shown in Table 1, the transparent resin layer has a recess (D1) that is in sync with the characteristic portion of the picture layer, and the thickness of the transparent resin layer and the surface protective layer and the upper yield point load in the flow direction (P MD ) and the upper yield point load in the width direction (P CD ) is within a specified range and in a specified ratio, the wood grain pattern of the design layer and the recesses are in harmony with each other, resulting in an extremely excellent design, and it has also been confirmed that the design is also suitable for wrapping. [Industrial Applicability]

[0106] According to the present invention, it is possible to provide a decorative sheet having extremely excellent design properties in which the picture pattern of the picture layer and the recesses are in harmony with each other and excellent workability for wrapping processes, and a decorative board using said decorative sheet. [Explanation of symbols]

[0107] 1 Base material 2. Picture layer 2a Characteristic parts 2b Non-characteristic parts 3 Transparent resin layer 4 Surface protective layer 10 Decorative Sheet

Claims

1. A decorative sheet having at least a design layer, a transparent resin layer, and a surface protective layer in this order on one side of a base sheet, The pattern layer is a wood grain pattern having a characteristic portion and a non-characteristic portion, the characteristic portion is formed of at least one pattern selected from the group consisting of vessels in wood grain, knots, annual rings, and spots, and the non-characteristic portion is a portion other than the characteristic portion, The transparent resin layer has a thickness of less than 90 μm, The surface protective layer has a thickness of less than 25 μm, The transparent resin layer has a recess (D1) on the side opposite to the side having the pattern layer, the recess (D1) being in sync with a characteristic portion of the pattern layer, The decorative sheet has an upper yield point load (P ＭＤ ) and the upper yield point load in the width direction (P ＣＤ ) is 25N or more and 35N or less, and the ratio of the upper yield point load in the machine direction to the upper yield point load in the width direction (P ＭＤ / P ＣＤ ) is 1.00 or more and 1.15 or less A decorative sheet characterized by:

2. 2. The decorative sheet according to claim 1, wherein the base sheet is a colored polyolefin film having a thickness of 50 μm or more and 70 μm or less.

3. The elastic modulus (E ＭＤ ) and the elastic modulus in the width direction (E ＣＤ ) are both 850 MPa or more and 1100 MPa or less, and the ratio of the elastic modulus in the machine direction to the elastic modulus in the width direction (E ＭＤ / E ＣＤ 3. The decorative sheet according to claim 1, wherein the value of (a) is 1.00 or more and 1.20 or less.

4. The decorative sheet according to any one of claims 1 to 3, wherein the characteristic portions of the pattern layer are formed from at least one pattern selected from the group consisting of vessels, knots, annual rings, and spots in wood grain, and the color difference ΔE between the characteristic portions and non-characteristic portions of the pattern layer is 1.3 or more.

5. A decorative board comprising the decorative sheet according to any one of claims 1 to 4 on an adherend.

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